Fair — AGENTS.md is prose the model has to re-interpret every session, and that reinterpretation is exactly where weaker models lose the thread. Here the plan is parsed and enforced as structured data: tasks with declared dependencies and one prompt each, so the per-step job is smaller and the plan isn't up for renegotiation. Nothing in that needs a frontier model I just haven't benchmarked it against deepseek-class runners, and the runner is pluggable if you want to be the one who does.